Hi mdnurnabi,
Welcome to fiverr, ! Although I am a level 2 seller, I am new to fiverr forum. But I can assist you with this. For the first week, try to use the fiverr mobile app and when you have time constantly check the app. Do not kill the app when you exit from it. This helps you to be online 24 hours. It may give you an exposure to the buyrs, and make sure you answer for a message, as soon as possible. Try this for a few weeks and let me know. Good Luck